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1 <!DOCTYPE html> |
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2 <html> |
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3 <head> |
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4 <title>Force-Directed Map</title> |
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5 <script type="text/javascript" src="../../d3.js"></script> |
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6 <script type="text/javascript" src="../../d3.geo.js"></script> |
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7 <script type="text/javascript" src="../../d3.geom.js"></script> |
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8 <script type="text/javascript" src="../../d3.layout.js"></script> |
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9 <style type="text/css"> |
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10 |
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11 path { |
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12 fill: #ddd; |
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13 fill-opacity: .8; |
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14 stroke: #fff; |
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15 stroke-width: 1.5px; |
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16 } |
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17 |
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18 line { |
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19 stroke: #999; |
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20 } |
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21 |
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22 </style> |
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23 </head> |
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24 <body> |
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25 <script type="text/javascript"> |
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26 |
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27 var w = 960, |
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28 h = 500; |
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29 |
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30 var path = d3.geo.path(), |
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31 force = d3.layout.force().size([w, h]); |
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32 |
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33 var svg = d3.select("body").append("svg:svg") |
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34 .attr("width", w) |
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35 .attr("height", h); |
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36 |
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37 d3.json("../data/us-states.json", function(states) { |
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38 var nodes = [], |
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39 links = []; |
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40 |
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41 states.features.forEach(function(d, i) { |
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42 if (d.id == "02" || d.id == "15" || d.id == "72") return; |
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43 var centroid = path.centroid(d); |
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44 centroid.x = centroid[0]; |
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45 centroid.y = centroid[1]; |
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46 centroid.feature = d; |
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47 nodes.push(centroid); |
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48 }); |
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49 |
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50 d3.geom.delaunay(nodes).forEach(function(d) { |
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51 links.push(edge(d[0], d[1])); |
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52 links.push(edge(d[1], d[2])); |
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53 links.push(edge(d[2], d[0])); |
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54 }); |
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55 |
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56 force |
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57 .gravity(0) |
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58 .charge(0) |
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59 .nodes(nodes) |
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60 .links(links) |
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61 .linkDistance(function(d) { return d.distance; }) |
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62 .start(); |
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63 |
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64 var link = svg.selectAll("line") |
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65 .data(links) |
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66 .enter().append("svg:line") |
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67 .attr("x1", function(d) { return d.source.x; }) |
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68 .attr("y1", function(d) { return d.source.y; }) |
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69 .attr("x2", function(d) { return d.target.x; }) |
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70 .attr("y2", function(d) { return d.target.y; }); |
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71 |
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72 var node = svg.selectAll("g") |
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73 .data(nodes) |
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74 .enter().append("svg:g") |
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75 .attr("transform", function(d) { return "translate(" + -d.x + "," + -d.y + ")"; }) |
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76 .call(force.drag) |
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77 .append("svg:path") |
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78 .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }) |
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79 .attr("d", function(d) { return path(d.feature); }); |
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80 |
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81 force.on("tick", function(e) { |
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82 link.attr("x1", function(d) { return d.source.x; }) |
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83 .attr("y1", function(d) { return d.source.y; }) |
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84 .attr("x2", function(d) { return d.target.x; }) |
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85 .attr("y2", function(d) { return d.target.y; }); |
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86 |
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87 node.attr("transform", function(d) { |
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88 return "translate(" + d.x + "," + d.y + ")"; |
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89 }); |
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90 }); |
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91 }); |
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92 |
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93 function edge(a, b) { |
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94 var dx = a[0] - b[0], dy = a[1] - b[1]; |
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95 return { |
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96 source: a, |
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97 target: b, |
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98 distance: Math.sqrt(dx * dx + dy * dy) |
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99 }; |
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100 } |
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101 |
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102 </script> |
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103 </body> |
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104 </html> |